Brass CuSO4 Patina
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Bob in SF

Location: San Francisco CA US
Posts: 2
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Steps (done outside with repirator mask, safety glasses, and gloves):
Cut brass disc and scrub with Penny Brite.
Paint with thin paste of CuSO4 pentahydrate/H2O.
Put in plastic container, then cover disc with sawdust, coffee grounds, and sand (about 1:1:1).
Drip 2 oz. of ammonia/distilled vinegar (2:1) onto it, close container tightly.
Leave outside x 3 days (our current ambient temperature is 40-60 degrees - temp will affect outcome).
Rinse disc gently in water, then stop process by soaking it in a saturated baking soda solution x 1 day.
Rinse again.
Preserve colors by spray coating with Behlen (or similar) brass lacquer.
Will use it for engraving, inlays, etc.
Inspired by expert metalsmith Tim McCreight.
(colors will vary widely)
· Date: Thu 9-February-2012 · Views: 1673 · Filesize: 148.0KB, 750.8KB · Dimensions: 999 x 767 ·
Keywords: brass, patina, CuSO4 pentahydrate, ammonia, vinegar, coffee grounds, sawdust, sand, Markison
Camera: D300
Lens & Filters: Micro-Nikkor 105
Film and/or ISO: 320
Aperture: 5.6
Shutter speed: 100
Location: San Francisco
Tripod & Head
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